Structure of handgrip and method for fabrication of same

ABSTRACT

New form of handgrip for various home appliances, and method for fabricating the same, including a core  2  with decorative color, and a transparent outer shell  3  for enclosing the core  2 , thereby solving problems of the present handgrip of peeling off of coating, and damage to carved, or relieved figures, or characters, and providing an outer look distinctive from the present handgrip.

TECHNICAL FIELD

The present invention relates to a structure of a handgrip applicable tovarious home appliances and a method for fabricating the same, and moreparticularly, to a structure of a handgrip applicable to various homeappliances, such as laundry, refrigerator, microwave range and so on,and door of vehicle, etc., and a method for fabricating the same.

BACKGROUND ART

FIG. 1 is an exemplary view of a conventional handgrip that is mainlyapplied to door or cover of home appliances. In order to fabricate theconventional handgrip, a mold having a desired handgrip-shaped cavity isfabricated and resin is then injected into the cavity to form ahandgrip. After that, the formed handgrip la is subject to a coatingtreatment of the surface thereof for the purpose of high grade of itsexternal appearance.

Meanwhile, in recent years, in addition to the function of a product,the sense of beauty in external appearance has settled down as a veryimportant element for market demand of products. Accordingly, productmanufacturers pay their special endeavors to the enhancement of whole orpartial sense of beauty.

In the light of this trend, the handgrip applied to various homeappliances is also fabricated in various forms considering whole senseof beauty of product along with functional aspect, but the conventionalhandgrip structure and the manufacturing method thereof does not advancethe function and sense of beauty of the handgrip in a remarkable formanymore. In other words, the handgrip 1 a fabricated by the conventionalmethod is generally coating-treated through a spraying method onto thesurface thereof, which may cause a problem in that the coated film peelsoff due to its repeated usage by user or is decolored after usage of itslong term to impede the sense of beauty.

In particular, the conventional handgrip has a drawback in that itspainted surface is very weak to contact with chemicals, such ascosmetics and so on.

Meanwhile, in case character or figure is carved or relieved on thesurface of the handgrip 1 a, there may occur a disadvantage in that thesurface is worn due to contact and collision with other articles causedby a long term usage, so that character or figure loses its originalshape.

In other words, in case of being carved, foreign particles are smearedin grooves of the surface, whereas in case of being relieved, fractureor friction of the surface may occur due to collision with otherarticles, so that the carved character or figure loses its originalshape and becomes dirty, thereby injuring beauty on appearance.

DISCLOSURE OF THE INVENTION

Accordingly, the present invention is directed to a handgrip structureand a method for fabricating the same that substantially obviate one ormore of the problems due to limitations and disadvantages of the relatedart.

An object of the present invention is to provide a new structure of ahandgrip and a method for fabricating the same in which a problem inthat coating peels off and a problem in that carved or relieved figureor character is damaged are solved, thereby capable of developing thebeauty on appearance of the handgrip differentially from a conventionalone.

Another object of the present invention is to provide a structure of ahandgrip and a method for fabricating the same in which it is possibleto develop beauty on appearance of the handgrip differentially from aconventional one, and weight thereof decreases to make it easy to handleit.

A further another object of the present invention is to provide astructure of a handgrip and a method for fabricating the same in whichin the handgrip structure in which a problem in that coating peels off,or a problem in that relieved or carved character or figure is damagedis solved, and it is possible to develop beauty on appearance of thehandgrip differentially from a conventional one, a phenomenon in that ittakes a long time in filling resin in a shell forming process, aphenomenon in that resin is not filled, and a phenomenon in that a weldline is formed are solved, and a problem in that an adhesive forcebetween core surface as treated and shell is insufficient and thus aspace is created between the core and the shell, and a scratch problemoccurring when the shell is a soft material, can be solved.

Additional features and advantages of the invention will be set forth inthe description which follows, and in part will be apparent from thedescription, or may be learned by practice of the invention. Theobjectives and other advantages of the invention will be realized andattained by the structure particularly pointed out in the writtendescription and claims thereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, there isprovided a handgrip comprising a colored core and a transparent shellcovering the core.

According to a second aspect of the invention, there is provided amethod for fabricating a handgrip, said method comprising the steps of:injecting a resin into a cavity of a mold for forming a core to form acore; extracting the formed core from the core forming mold; loading thecore extracted from the core forming mold into a shell forming moldhaving a cavity that is larger in volume than the core; injecting atransparent resin into the cavity of the shell forming mold to form ashell covering the core; extracting the handgrip comprised of the coreand the shell covering the core from the shell forming mold.

According to a third aspect of the invention, there is provided ahandgrip comprising a colored core having a cavity therein and atransparent shell covering the core.

According to a fourth aspect of the invention, there is provided amethod for fabricating a handgrip, said method comprising the steps of:injecting a resin into a cavity of a mold for forming a core; blowing agas into an interior of the core to form the core having a cavitytherein; extracting the formed core from the core forming mold; loadingthe core extracted from the core forming mold into a shell forming moldhaving a cavity that is larger in volume than the core; injecting atransparent resin into the cavity of the shell forming mold to form ashell covering the core; extracting the handgrip comprised of the coreand the shell covering the core from the shell forming mold.

According to a fifth aspect of the invention, there is provided ahandgrip comprising a colored core having a cavity therein and atransparent shell covering the core.

According to a sixth aspect of the invention, there is provided a methodfor fabricating a handgrip, said method comprising the steps of:injecting a resin into a cavity of a mold for forming a core; blowing agas into an interior of the core to form the core having a cavitytherein and a coupling boss at both ends thereof; extracting the formedcore from the core forming mold; loading the core extracted from thecore forming mold into a shell forming mold having a cavity that islarger in volume than the core; injecting a transparent resin into thecavity of the shell forming mold to form a shell covering the core;extracting the handgrip comprised of the core and the shell covering thecore from the shell forming mold.

According to a seventh aspect of the invention, there is provided ahandgrip comprising a colored core having a concaved groove formedwholly along a length direction at a lower surface thereof, and atransparent shell covering the core.

According to an eighth aspect of the invention, there is provided amethod for fabricating a handgrip, said method comprising the steps of:injecting a resin into a cavity of a mold for forming a core to form thecore having a color and a concaved groove formed wholly along a lengthdirection at a lower surface thereof; extracting the formed core fromthe core forming mold; loading the core extracted from the core formingmold into a shell forming mold having a cavity that is larger in volumethan the core; injecting a transparent resin into the cavity of theshell forming mold to form a shell covering the core; extracting thehandgrip comprised of the core and the shell covering the core from theshell forming mold.

According to a ninth aspect of the invention, there is provided a methodfor fabricating a handgrip, said method comprising the steps of: moldinga core having a predetermined curvature; loading the core into a shellforming mold having a cavity that is larger in volume than the core; andinjecting a transparent resin into the cavity of the shell forming moldto form a shell covering the core, wherein a gate of the shell formingmold is located prior to performing the step of forming the shell at aposition forming a thick leaf portion after completion of the forming ofthe shell.

At this time, the gate of the shell forming mold is formed preferablydeclined by a predetermined angle with respect to a horizontal plane,and more preferably, declined along a tangent direction drawn to passthrough one end of the gate and be in contact with an upper surface ofthe core.

Meanwhile, prior to loading the molded core into the shell forming mold,a surface treatment for coloring a surface of the core is carried out.

At this time, the surface treatment includes the steps of: covering apredetermined region of the core with a mask so as to define thepredetermined region where a colored layer should not be formed; formingthe colored layer except for the predetermined region covered with themask; and removing the mask.

Meanwhile, after the molding of the shell, if the shell is of a softmaterial such as Surlyn or the like, a glossy wax is coated on thesurface of the shell.

According to the handgrips of the invention having the aboveconstructions, there is solved a problem of the conventional handgrip inthat coating peels off, or relieved or carved figure or character isdamaged, and it becomes possible to develop beauty of the handgrip onappearance.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention.

In the drawings:

FIG. 1 is a perspective view of a handgrip applied to home appliances orthe like according to the conventional art;

FIG. 2 is a perspective view showing one application example of ahandgrip structure according to an embodiment of the present invention;

FIG. 3 is a plan view of a handgrip according to a first embodiment ofthe present invention;

FIG. 4 is a bottom view of FIG. 3;

FIG. 5 is a longitudinal sectional view taken along the line I—I of FIG.3;

FIG. 6 is a flow chart showing a fabrication procedure of a handgripaccording to a first embodiment of the present invention;

FIG. 7 is a schematic view showing a state in which a core is loadedinto a mold;

FIG. 8 a is a plan view of the core shown in FIG. 7;

FIG. 8 b is a front view of FIG. 8 a;

FIG. 9 is a schematic view of a state in which a core is loaded into amold according to another embodiment of the present invention;

FIG. 10 is a plan view of a handgrip according to a second embodiment ofthe present invention;

FIG. 11 is a bottom view of FIG. 10;

FIG. 12 is a longitudinal sectional view taken along the line I—I line;

FIG. 13 is a flow chart showing a fabrication procedure of a handgripaccording to a second embodiment of the present invention;

FIG. 14 is a view schematically showing the fabrication procedure ofFIG. 13;

FIG. 15 is a schematic view showing a state in which a core is loadedinto a mold;

FIG. 16 a is a plan view of the core shown in FIG. 15;

FIG. 16 b is a front view of FIG. 16 a;

FIG. 17 is a schematic view showing a state in which a core is loadedinto a mold according to another embodiment of the present invention;

FIG. 18 is a plan view of a handgrip according to a third embodiment ofthe present invention;

FIG. 19 is a bottom view of FIG. 18;

FIG. 20 is a longitudinal sectional view taken along the line I—I ofFIG. 18;

FIG. 21 is a flow chart showing a fabrication procedure of a handgripaccording to a third embodiment of the present invention;

FIG. 22 is a conceptual view schematically showing the fabricationprocedure of FIG. 21;

FIG. 23 is a schematic view showing a state in which a core is loadedinto a mold;

FIG. 24 a is a plan view showing the core structure of FIG. 20;

FIG. 24 b is a front view of FIG. 24 a;

FIG. 25 is a plan view of a handgrip according to a fourth embodiment ofthe present invention;

FIG. 26 is a bottom view of FIG. 25;

FIG. 27 is a longitudinal sectional view taken along the line I—I ofFIG. 25;

FIG. 28 is a perspective view of the core shown in FIG. 27;

FIG. 29 is a flow chart showing a fabrication procedure according to afourth embodiment of the present invention;

FIG. 30 is to illustrate a problem that may be generated in thefabricating methods of a handgrip, that have been applied prior to amethod for fabricating a handgrip according to a fifth embodiment of thepresent invention, and is a sectional view showing a state in which thehandgrip is loaded into a shell forming mold;

FIG. 31 is to illustrate a method for fabricating a handgrip accordingto a fifth embodiment of the present invention, and is a sectional viewshowing a state in which core is loaded into a shell forming mold;

FIG. 32 is to illustrate a characteristic of the method according to thefifth embodiment, and is an exemplary sectional view of a masking regionarranged on the surface of a core; and

FIG. 33 is a bottom perspective view of a core, which shows the maskingregion of FIG. 32.

DESCRIPTION OF REFERENCE NUMERALS IN MAIN PORTIONS OF THE DRAWINGS

1: Handgrip 2: Core 200: Clamping rib 210: Supporting rib 220: Concavedportion 230: Reinforcing rib 240a, 240b: Coupling boss 250: Cavity part260: Concaved groove 3: Shell 4: Shell forming mold 4a: Upper mold 4b:Lower mold 40: Shell forming mold 40a: Upper mold 40b: Lower mold 410:Gate 500: Masking region

BEST MODE FOR CARRYING OUT THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings of FIGS. 2 to 33.

First, a handgrip structure and a fabrication method thereof accordingto a first embodiment of the present invention will be described withreference to FIGS. 2 to 9.

FIG. 2 is a perspective view showing one application example of ahandgrip structure according to an embodiment of the present invention,FIG. 3 is a plan view of a handgrip according to a first embodiment ofthe present invention, FIG. 4 is a bottom view of FIG. 3, and FIG. 5 isa longitudinal sectional view taken along the line I—I of FIG. 3.

A handgrip 1 according to a first embodiment of the present inventionincludes a colored core 2, and a transparent shell 3 covering the core2.

The core 2 is preferably made in a bar type. In case of the bar typecore, it is more preferably that the core 2 has a predeterminedcurvature along a selected direction for an easy grip.

At least one of both ends of the core 2 is a streamline shape, and atleast one of both ends of the shell 3 may be a streamline shape.

At least one end of the shell 3 may be a fan shape as it travels to bothends. Especially, a portion corresponding to both oblique sides of thefan shape is preferably inwardly curved for an easy grip.

In other words, in the fan shape structure of the shell 3, in case theportion corresponding to both oblique sides is inwardly curved, whenlooking at the grip of the handgrip 1 according to the first embodimentof the present invention from the ergonomic point of view, the handgripis well harmonized with shape of side palm as fisted and shape of thumbor middle finger, thereby making a role in increasing grip force for thehandgrip 1 and helping to easily grip the handgrip 1.

For saving material and forming time, and preventing a contractionphenomenon upon forming the handgrip, it is desirous that a concavedportion 220 is formed on a lower surface of the core 2. In this case, areinforcing rib for the enhancement of strength is preferably providedin the concaved portion 220 on the lower surface of the core 2.

The reason is to prevent the core 2 from being deformed by transparentresin that is injected at high speed and high pressure for the formationof the shell 3. The reinforcing rib 230 maybe formed in various shapes,for instance, lattice shape.

Meanwhile, FIG. 7 schematically shows a state in which a core 2 having aclamping rib 200 formed at both ends thereof is loaded into a mold,FIGS. 8 a and 8 b are respectively a plan view and a front view of thecore shown in FIG. 7. The core 2 includes the clamping rib 200 whichwhen the core is loaded into a mold for the formation of shell, allowsthe core to be supported by the mold. It is preferable that the clampingrib 200 is respectively provided at both ends of the core 2, inparticular at a lower side of the both ends of the core 2 so as to beclamped between an upper mold 4 a and a lower mold 4 b. Why the clampingrib 200 is provided at the lower side of the both ends of the core 2 is,in case of removing the clamping rib 200 after the formation of theshell, to get rid of the trace that the clamping rib 200 was placed.

FIG. 9 is a schematic view of a state in which a core is loaded into amold according to another embodiment of the present invention, andcorresponds to a case in which a clamping rib 200 is formed at one endportion of the core 2, and a supporting rib 210 is formed on a bottomsurface of the other end. The supporting rib 210 is, when the core isloaded into a shell forming mold 4, in contact with a bottom surface ofa cavity of a lower mold.

In other words, at the bottom surface of at least one end portion of theboth end portions of the core 2 is formed the supporting rib 210, whenthe core is loaded into the shell forming mold 4, in contact with abottom surface of a cavity of a lower mold 4 b.

Naturally, in this case, a mold designed differently than that shown inFIG. 7 is used.

Meanwhile, a metal layer may be formed on the surface of the core 2. Atthis time, the metal layer is formed by a plating method or a sputteringdeposition.

Simultaneously, a color may be added to the shell 3 so as to maintaintransparency of the shell 3 and beautify the appearance. In other words,the shell 3 may be formed from a transparent resin that has a color butdoes not weaken or harm the transparency and at the same time beautifiesthe appearance.

Preferably, the core 2 has a material property of which melting point ishigher than that of the shell 3. More specifically, it is desirous thatthe melting point of the core 2 is 200° C. or more and the melting pointof the shell 3 is below 150° C.

Also, the core is of a material having impact-resistant, high strength,high fluidity, high gloss and high plating-adhering strength. Forexample, the core is of Nylon, PC (Polycarbonate) or the like.

Meanwhile, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. In order to satisfy these conditions, the shell is of ABS,PMMA, Surlyn, ASA, ALPHALAC or the like.

A character or figure may be carved or relieved on the surface of thecore 2. In this case, the character or figure carved or relieved on thesurface of the core 2 is the transparent shell 3 and thus isrecognizable from an outside, and since a contact of the character orfigure with other article is prevented, there exists an advantage inthat the character or figure loses its original shape.

Meanwhile, the core 2 may be formed of metal, which is to prepare incase a weight or a very high strength necessary for the handgrip isrequested.

Also, it is desirous that the core 2 or the lower surface of the shell 3has a dimple structure such that it is easy to grip the handgrip.

Further, the handgrip 1 according to the first embodiment of theinvention is molded to have a coupling boss 240 a, 240 b. Accordingly,the handgrip 1 is screw-coupled with a door, or a coupling hole isdirectly processed on the bottom surface after molding thereof, and thenit is screw-coupled with a door or the like. In case the supporting rib210 is placed at the lower surface of both ends of the core 2, thecoupling hole may be processed on the supporting rib 210.

A method for fabricating a handgrip having the above structure accordingto the first embodiment of the present invention is described withreference to FIGS. 6 to 9.

First, a mold (not shown) for forming a core is prepared and a meltedresin having a color is injected into the core forming mold at a highspeed and a high pressure. In other words, the core is formed by aninjection molding that is a representative of plastic processing methodsand is widely used in processing plastic products having a complicatedshape.

At this time, the core forming mold is designed to be provided, at anouter side thereof when the core has been formed, with a clamping rib200 that is clamped by a mold 4 for forming a shell.

Meanwhile, after the injection of the melted resin into the cavity ofthe core forming mold, the injected resin is cooled.

After the resin has been cooled, the core forming mold is opened and theformed core 2 is extracted from the core forming mold.

Next, the core 2 extracted from the core forming mold is loaded into ashell forming mold 4 having a cavity 400 that is larger in volume thanthe core 2. At this time, the clamping rib 200 of the core 2 is clampedby an upper mold 4 a and a lower mold 4 b to be supported, so that aspace part is formed between the core 2 loaded into the shell formingmold 4 and the inner wall of the cavity 400 of the shell forming mold.

As above, after the core 2 has been loaded into the shell forming mold4, the melted resin is injected into the cavity 400 of the shell formingmold 4 at a high speed and a high pressure, and after the completion ofthe injection, the injected transparent resin is cooled.

After the completion of the cooling, a handgrip including the core 2 andthe shell 3 covering the core 2 is extracted from the shell forming mold4.

Thereafter, the clamping rib 200 formed on the outer surface of the core2 of the extracted handgrip is removed, so that only the core 2 and theshell 3 remain.

In other words, since the clamping rib 200 is formed at a lower side ofone end of the core 2, when the handgrip from which the clamping rib 200is removed is installed in a door or the like as shown in FIG. 2, atrace of the clamping rib 200 does not remain, so that appearance of thehandgrip is beautified.

Meanwhile, in case a supporting protrusion is downwardly formed at thebottom surface of one end of the core and clamping rib 200 is arrangedat the other end of the core, a trace of the clamping rib 200 or thesupporting protrusion is not shown on appearance likewise.

In the aforementioned fabrication method of the handgrip 1 according tothe first embodiment of the present invention, the core may befabricated by blow molding.

Also, after the completion of the forming of the core 2, prior toloading the core 2 into the shell forming mold 4, the step of carving orrelieving a character or figure on the surface of the formed core 2 maybe further included.

Separately, after the completion of the forming of the core 2, a metallayer may be formed on the surface of the core 2, which is formed by aplating or a sputtering deposition.

Further, the core 2 applied to the fabrication method of the handgripaccording to the first embodiment of the present invention is made of amaterial of which melting point should be 200° C. or more and themelting point of the shell should be below 150° C.

Furthermore, the core 2 is preferably of a material havingimpact-resistant, high strength, high fluidity, high gloss and highplating-adhering strength properties. The material having the aboveproperties of the core 2 includes Nylon and PC.

Moreover, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. The material having the above properties of the shell 3includes ABS, PMMA, Surlyn, ASA and ALPHALAC.

Also, the shell 3 applied to the fabrication method of the handgripaccording to the first embodiment of the present invention is atransparent resin that has a color but does not weaken or harm thetransparency and at the same time beautifies the appearance.

Next, a second preferred embodiment of the invention will be nowdescribed in detail with reference to the accompanying drawings of FIG.2 and FIGS. 10 to 17.

FIG. 2 is a perspective view showing one application example of ahandgrip structure according to a second embodiment of the presentinvention, FIG. 10 is a plan view of a handgrip according to a secondembodiment of the present invention, FIG. 11 is a bottom view of FIG.10, and FIG. 12 is a longitudinal sectional view taken along the lineI—I line.

A handgrip 1 according to a second embodiment of the present inventionincludes a colored core 2 having a cavity therein, and a transparentshell covering the core 2. The core 2 is preferably made in a bar type.In case of the bar type core, it is more preferably that the core 2 hasa predetermined curvature along a selected direction for an easy grip.

At least one of both ends of the core 2 is a streamline shape, and atleast one of both ends of the shell 3 may be a streamline shape.

At least one end of the shell 3 may be a fan shape as it travels to bothends. Especially, a portion corresponding to both oblique sides of thefan shape is preferably inwardly curved for an easy grip.

In other words, in the fan shape structure of the shell 3, in case theportion corresponding to both oblique sides is inwardly curved, whenlooking at the grip of the handgrip according to the second embodimentof the present invention from the ergonomic point of view, the handgripis well harmonized with shape of side palm as fisted and shape of thumbor middle finger, thereby making a role in increasing grip force for thehandgrip 1 and helping to easily grip the handgrip 1.

Meanwhile, FIG. 15 is a schematic view showing a state in which the core2 having a clamping rib 200 formed at both ends is loaded into a mold,FIGS. 16 a and 16 b are respectively a plan view of the core shown inFIG. 15 and a front view. The core 2 includes the clamping rib 200 whichwhen the core 2 is loaded into a mold for the formation of shell, allowsthe core to be supported by the mold. It is preferable that the clampingrib 200 is respectively provided at both ends of the core 2, inparticular at a lower side of the both ends of the core 2 so as to beclamped between an upper mold 4 a and a lower mold 4 b.

Why the clamping rib 200 is provided at the lower side of the both endsof the core 2 is, in case of removing the clamping rib 200 after theformation of the shell, to get rid of the trace that the clamping rib200 was placed.

FIG. 17 is a schematic view showing a state in which the core is loadedinto a mold according to another embodiment of the present invention,and corresponds to a case in which a clamping rib 200 is formed at oneend portion of the core 2, and a supporting rib 210 is formed on abottom surface of the other end. The supporting rib 210 is, when thecore is loaded into a shell forming mold 4, in contact with a bottomsurface of a cavity 400 of a lower mold.

In other words, at the bottom surface of at least one end portion of theboth end portions of the core 2 is formed the supporting rib 210, whenthe core is loaded into the shell forming mold 4, in contact with alower mold 4 b.

Naturally, in this case, a mold designed differently than that shown inFIG. 15 is used.

Meanwhile, a metal layer may be formed on the surface of the core 2. Atthis time, the metal layer is formed by a plating method or a sputteringdeposition.

Simultaneously, a color may be added to the shell 3 so as to maintaintransparency of the shell 3 and beautify the appearance. In other words,the shell 3 may be formed from a transparent resin that has a color butdoes not weaken or harm the transparency and at the same time beautifiesthe appearance.

Preferably, the core 2 has a material property of which melting point ishigher than that of the shell 3. More specifically, it is desirous thatthe melting point of the core 2 is 200° C. or more and the melting pointof the shell 3 is below 150° C.

Also, the core is of a material having impact-resistant, high strength,high fluidity, high gloss and high plating-adhering strength. An exampleof the core material for satisfying such conditions includes Nylon, PC(Polycarbonate) or the like.

Meanwhile, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. In order to satisfy these conditions, the shell is of ABS,PMMA, Surlyn, ASA, ALPHALAC or the like.

A character or figure may be carved or relieved on the surface of thecore 2.

Meanwhile, it may be desirous that the core 2 is heavy. In this case,the core 2 may be of metal.

Also, it is desirous that the core 2 or the lower surface of the shell 3has a dimple structure such that it is easy to grip the handgrip.

Further, the handgrip 1 according to the second embodiment of theinvention is molded to have a coupling boss 240 a, 240 b at both endsthereof. Accordingly, the handgrip 1 is screw-coupled with a door, or acoupling hole is directly processed on the bottom surface after moldingthereof, and then it is screw-coupled with a door or the like. In casethe supporting rib 210 is placed at the lower surface of both ends ofthe core 2, the coupling hole may be processed on the supporting rib210.

A method for fabricating a handgrip having the above structure accordingto the second embodiment of the present invention is described withreference to FIGS. 13 to 17.

First, a mold 6 for forming a core is prepared and a melted resin havinga color is injected into the core forming mold 6. (Refer to “(a)” ofFIG. 14) In other words, the core is formed by an injection molding thatis a representative of plastic processing methods and is widely used inprocessing plastic products having a complicated shape.

At this time, the core forming mold 6 may be designed to be provided, atan outer side thereof when the core has been formed, with a clamping rib200 that is clamped by a mold 4 for forming a shell.

Meanwhile, after the injection of the melted resin into the cavity ofthe core forming mold 6 by a certain amount, a gas is injected into aninterior of the melted resin to thereby expand the melted resin. (Referto “(b) of FIG. 14)

Thereafter, the melted resin is cooled through a holding pressureprocess with preventing contraction of the resin. (Refer to “(c)” ofFIG. 14) Thereafter, the gas is exhausted to complete the forming of thecore having the hollow cavity for the handgrip. (Refer to “(d)” of FIG.14)

In the holding pressure process that is carried out as the next processto the injection process of the melted resin inside the mold, a specificpressure is applied to the injection inlet of the resin, and in thisstate, cooling of the filled material is carried out along with anadditive introduction of the resin by the pressing, so that it becomespossible to minimize non-uniform contraction causing warpage of product.

Meanwhile, after the molded core 2 is extracted, the extracted core 2 isloaded into a shell forming mold 4 having a cavity 400 that is larger involume than the core 2 and an insertion injection is carried out tocomplete a handgrip. (Refer to “(e)” of FIG. 14) At this time, theclamping rib 200 of the core 2 is clamped by an upper mold 4 a and alower mold 4 b to be supported, so that a space part is formed betweenthe core 2 loaded into the shell forming mold 4 and the inner wall ofthe cavity 400 of the shell forming mold 4.

As above, after the core 2 has been loaded into the shell forming mold4, the melted resin is injected into the cavity 400 of the shell formingmold 4 at a high speed and a high pressure, and after the completion ofthe injection, the injected transparent resin is cooled.

After the completion of the cooling, a handgrip including the core 2 andthe shell 3 covering the core 2 is extracted from the shell forming mold4.

Thereafter, the clamping rib 200 formed on the outer surface of the core2 of the extracted handgrip is removed, so that only the core 2 and theshell 3 remain.

In other words, since the clamping rib 200 is formed at a lower side ofone end of the core 2, when the handgrip from which the clamping rib 200is removed is installed in a door or the like as shown in FIG. 2, atrace of the clamping rib 200 does not remain, so that appearance of thehandgrip is beautified.

Meanwhile, in case a supporting protrusion is downwardly formed at thebottom surface of one end of the core and clamping rib 200 is arrangedat the other end of the core, a trace of the clamping rib 200 or thesupporting protrusion is not shown on appearance likewise.

Also, after the completion of the forming of the core 2, prior toloading the core 2 into the shell forming mold 4, the step of carving orrelieving a character or figure on the surface of the formed core 2 maybe further included.

Separately, after the completion of the forming of the core 2, a metallayer may be formed on the surface of the core 2, which is formed by aplating or a sputtering deposition.

Further, the core 2 applied to the fabrication method of the handgripaccording to the second embodiment of the present invention is made of amaterial of which melting point should be 200° C. or more and themelting point of the shell should be below 150° C.

Furthermore, the core 2 is preferably of a material havingimpact-resistant, high strength, high fluidity, high gloss and highplating-adhering strength properties. The material having the aboveproperties of the core 2 includes Nylon and PC.

Moreover, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. The material having the above properties of the shell 3includes ABS, PMMA, Surlyn, ASA and ALPHALAC.

According to the second embodiment of the present invention, the resinmay be a transparent resin that has a color but does not weaken or harmthe transparency and at the same time beautifies the appearance.

Next, a third preferred embodiment of the invention will be nowdescribed in detail with reference to the accompanying drawings of FIGS.18 to 24 b.

FIG. 2 is a perspective view showing one application example of ahandgrip structure according to a third embodiment of the presentinvention, FIG. 18 is a plan view of a handgrip according to a thirdembodiment of the present invention, FIG. 19 is a bottom view of FIG.18, and FIG. 20 is a longitudinal longitudinal sectional view takenalong the line I—I of FIG. 18.

A handgrip 1 according to a third embodiment of the present inventionincludes a colored core 2 having a cavity therein and a coupling bossformed at both ends thereof, and a transparent shell 3 covering the core2.

At this time, the core 2 is preferably made in a bar type. In case ofthe bar type core, it is more preferably that the core 2 has apredetermined curvature along a selected direction for an easy grip.

At least one of both ends of the core 2 is a streamline shape, and atleast one of both ends of the shell 3 may be a streamline shape.

At least one end of the shell 3 may be a fan shape as it travels to bothends. Especially, a portion corresponding to both oblique sides of thefan shape is preferably inwardly curved for an easy grip.

In other words, in the fan shape structure of the shell 3, in case theportion corresponding to both oblique sides is inwardly curved, whenlooking at the grip of the handgrip according to the third embodiment ofthe present invention from the ergonomic point of view, the handgrip iswell harmonized with shape of side palm as fisted and shape of thumb ormiddle finger, thereby making a role in increasing grip force for thehandgrip 1 and helping to easily grip the handgrip 1.

Meanwhile, FIG. 23 is a schematic view showing a state in which a core 2having a clamping rib 200 formed at both ends is loaded into a mold,FIGS. 24 a and 24 b are respectively a plan view of the core shown inFIG. 23 and a front view. The core 2 includes the clamping rib 200 whichwhen the core 2 is loaded into a mold for the formation of shell, allowsthe core to be supported by the mold. It is preferable that the clampingrib 200 is respectively provided at both ends of the core 2, inparticular at a lower side of the both ends of the core 2 so as to beclamped between an upper mold 4 a and a lower mold 4 b.

Why the clamping rib 200 is provided at the lower side of the both endsof the core 2 is, in case of removing the clamping rib 200 after theformation of the shell, to get rid of the trace that the clamping rib200 was placed.

Meanwhile, a metal layer may be formed on the surface of the core 2. Atthis time, the metal layer is formed by a plating method or a sputteringdeposition.

Simultaneously, a color may be added to the shell 3 so as to maintaintransparency of the shell 3 and beautify the appearance. In other words,the shell 3 may be formed from a transparent resin that has a color butdoes not weaken or harm the transparency and at the same time beautifiesthe appearance.

Preferably, the core 2 has a material property of which melting point ishigher than that of the shell 3. More specifically, it is desirous thatthe melting point of the core 2 is 200° C. or more and the melting pointof the shell 3 is below 150° C.

Also, the core is of a material having impact-resistant, high strength,high fluidity, high gloss and high plating-adhering strength. An exampleof the core material for satisfying such conditions includes Nylon, PC(Polycarbonate) or the like.

Meanwhile, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. In order to satisfy these conditions, the shell is of ABS,PMMA, Surlyn, ASA, ALPHALAC or the like.

A character or figure may be carved or relieved on the surface of thecore 2.

Meanwhile, it may be desirous that the core 2 is heavy. In this case,the core 2 may be of metal.

Also, the lower surface of the shell 3 is formed in a concavo-convexstructure having a dimple portion such that slip is prevented to therebymake it easy to grip the handgrip.

Further, according to the third embodiment of the invention, thecoupling boss 240 a, 240 b functions to allow the handgrip to bescrew-coupled with a door, a lid or the like.

A method for fabricating a handgrip having the above structure accordingto the third embodiment of the present invention is described withreference to FIGS. 21 to 24 b.

First, in a state that a mold 6 for forming a core is prepared, a meltedresin having a color is injected into the core forming mold 6. (Refer to“(a)” of FIG. 22) In other words, the core is formed by an injectionmolding that is a representative of plastic processing methods and iswidely used in processing plastic products having a complicated shape.

At this time, the core forming mold 6 may be designed to be provided, atan outer side thereof when the core has been formed, with a clamping rib200 that is clamped by a mold 4 for forming a shell, and with a couplingboss 240 a, 240 b that is coupled with a door or the like after thecompletion of the handgrip.

Meanwhile, after the injection of the melted resin into the cavity ofthe core forming mold 6 by a certain amount, a gas is injected into aninterior of the melted resin to thereby expand the melted resin. (Referto “(b) of FIG. 22)

Thereafter, the melted resin is cooled through an holding pressureprocess with preventing contraction of the resin. (Refer to “(c)” ofFIG. 22) Thereafter, the gas is exhausted to complete the forming of thecore having the hollow cavity for the handgrip. (Refer to “(d)” of FIG.22)

Here, in order to enable to form the coupling boss 240 a, 240 b, agroove 600 for forming the boss is formed in a lower mold of the mold 6,and a rod-shaped rib 601 that after the mold 6 is removed, makes acoupling hole of the coupling boss 240 a, 240 b formed is provided at acenter portion of the boss forming groove 600.

In the holding pressure process that is carried out as the next processto the injection process of the melted resin inside the mold, a specificpressure is applied to the injection inlet of the resin, and in thisstate, cooling of the filled material is carried out along with anadditive introduction of the resin by the pressing, so that it becomespossible to minimize non-uniform contraction causing warpage of product.

Meanwhile, after the molded core 2 is extracted, the extracted core 2 isloaded into a shell forming mold 4 having a cavity 400 that is larger involume than the core 2 and an insertion injection is carried out tocomplete a handgrip. (Refer to “(e)” of FIG. 22)

In other words, the clamping rib 200 formed at one end of the core 2 isclamped between an upper mold 4 a and a lower mold 4 b and at the sametime the coupling boss 240 a formed at the other end is in contact withinner surface of the lower mold 4 b, and thus the core is supported, sothat a space part is formed between the core 2 loaded into the shellforming mold 4 and the inner wall of the cavity 400 of the shell formingmold 4. After that, as above, after the core 2 has been loaded into theshell forming mold 4, the melted resin is injected into the cavity 400of the shell forming mold 4 at a high speed and a high pressure, andafter the completion of the injection, the injected transparent resin iscooled.

After the completion of the cooling, a handgrip including the core 2 andthe shell 3 covering the core 2 is extracted from the shell forming mold4.

Thereafter, the clamping rib 200 formed on the outer surface of the core2 of the extracted handgrip is removed, so that only the core 2 and theshell 3 remain.

In other words, since the clamping rib 200 is formed at a lower side ofone end of the core 2, when the handgrip from which the clamping rib 200is removed is installed in a door or the like as shown in FIG. 2, atrace of the clamping rib 200 does not remain, so that appearance of thehandgrip is beautified.

Also, after the completion of the forming of the core 2, prior toloading the core 2 into the shell forming mold 4, the step of carving orrelieving a character or figure on the surface of the formed core 2 maybe further included.

Separately, after the completion of the forming of the core 2, a metallayer may be formed on the surface of the core 2, which is formed by aplating or a sputtering deposition.

Further, the core 2 applied to the fabrication method of the handgripaccording to the third embodiment of the present invention is made of amaterial of which melting point should be 200° C. or more and themelting point of the shell should be below 150° C.

Furthermore, the core 2 is preferably of a mater al havingimpact-resistant, high strength, high fluidity, high gloss and highplating-adhering strength properties. The material having the aboveproperties of the core 2 includes Nylon and PC.

Moreover, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. The material having the above properties of the shell 3includes ABS, PMMA, Surlyn, ASA and ALPHALAC.

According to the third embodiment of the present invention, the resinmay be a transparent resin that has a color but does not weaken or harmthe transparency and at the same time beautifies the appearance.

Hereinafter, a handgrip structure and a method for fabricating the sameaccording to a fourth embodiment of the present invention are describedwith reference to FIG. 2 and FIGS. 25 to 29.

FIG. 2 is a perspective view showing one application example of ahandgrip structure according to a fourth embodiment of the presentinvention, FIG. 25 is a plan view of a handgrip according to a fourthembodiment of the present invention, FIG. 26 is a bottom view of FIG.25, and FIG. 27 is a longitudinal sectional view taken along the lineI—I of FIG. 25.

Also, FIG. 28 is a perspective view of the core shown in FIG. 27, andFIG. 29 is a flow chart showing a fabrication procedure according to afourth embodiment of the present invention.

According to a fourth embodiment of the present invention, a handgrip 1includes a colored core 2 having a concaved groove formed wholly along alength direction at a lower surface thereof and a coupling boss formedat both ends thereof, and a transparent shell 3 covering the core 2.Here, the core 2 is preferably made in a bar type. In case of the bartype core, it is more preferably that the core 2 has a predeterminedcurvature along a selected direction for an easy grip.

At least one of both ends of the core 2 is a streamline shape, and atleast one of both ends of the shell 3 may be a streamline shape.

At least one end of the shell 3 may be a fan shape as it travels to bothends. Especially, a portion corresponding to both oblique sides of thefan shape is preferably inwardly curved for an easy grip.

In other words, in the fan shape structure of the shell 3, in case theportion corresponding to both oblique sides is inwardly curved, whenlooking at the grip of the handgrip according to the fourth embodimentof the present invention from the ergonomic point of view, the handgripis well harmonized with shape of a side of the hand as fisted and shapeof thumb or middle finger, thereby making a role in increasing gripforce for the handgrip 1 and helping to easily grip the handgrip 1.

Meanwhile, the core 2 has a clamping rib 200 such that the core 2 issupported within a mold when the core is loaded into the mold to formthe shell 3. The clamping rib 200 is provided at one end of the core 2such that the clamping rib 200 is clamped between the lower mold and theupper mold, to support the core 2 along with the coupling boss 240 a,240 b.

Why the clamping rib 200 is provided at the lower side of one end of thecore 2 is, in case of removing the clamping rib 200 after the formationof the shell 3, to get rid of the trace that the clamping rib 200 wasplaced.

Meanwhile, a metal layer may be formed on the surface of the core 2. Atthis time, the metal layer is formed by a plating method or a sputteringdeposition.

Simultaneously, a color may be added to the shell 3 so as to maintaintransparency of the shell 3 and beautify the appearance. In other words,the shell 3 may be formed from a transparent resin that has a color butdoes not weaken or harm the transparency and at the same time beautifiesthe appearance.

Preferably, the core 2 has a material property of which melting point ishigher than that of the shell 3. More specifically, it is desirous thatthe melting point of the core 2 is 200° C. or more and the melting pointof the shell 3 is below 150° C.

Also, the core is of a material having impact-resistant, high strength,high fluidity, high gloss and high plating-adhering strength. An exampleof the core material for satisfying such conditions includes Nylon, PC(Polycarbonate) or the like.

Meanwhile, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. In order to satisfy these conditions, the shell is of ABS,PMMA, Surlyn, ASA, ALPHALAC or the like.

Also, character or figure may be carved or relieved on the surface ofthe core 2.

Also, the lower surface of the shell 3 is formed in a concavo-convexstructure having a dimple portion such that slip is prevented to therebymake it easy to grip the handgrip.

According to the fourth embodiment of the invention, the coupling boss240 a, 240 b formed at both ends during the molding of the corefunctions to allow the handgrip to be screw-coupled with a door, a lidor the like.

Hereinafter, a method for fabricating a handgrip having the abovestructure according to the fourth embodiment of the present invention isdescribed as follows.

First, in a state that a mold 6 for forming a core is prepared, a meltedresin having a color is injected into the core forming mold 6. In otherwords, the core is formed by an injection molding that is arepresentative of plastic processing methods and is widely used inprocessing plastic products having a complicated shape.

At this time, the core forming mold 6 may be designed to have at anouter side thereof when the core has been formed, a clamping rib 200that is clamped by a mold for forming a shell, a coupling boss 240 a,240 b that is coupled with a door or the like after the completion ofthe handgrip, and a concaved groove 260 below the coupling boss.

Here, in order to enable to form the coupling boss 240 a, 240 b, agroove for forming the boss is formed in a lower mold of the mold 6, anda rod-shaped rib that after the mold 6 is removed, makes a coupling holeof the coupling boss 240 a, 240 b formed is provided at a center portionof the boss forming groove.

Meanwhile, after the molded core 2 is extracted, the extracted core 2 isloaded into a shell forming mold 4 having a cavity 400 that is larger involume than the core 2 and an insertion injection is carried out tocomplete a handgrip.

In other words, the clamping rib 200 formed at one end of the core 2 isclamped between an upper mold 4 a and a lower mold 4 b and at the sametime the coupling boss 240 a formed at the other end is in contact withinner surface of the lower mold 4 b, and thus the core is supported, sothat a space part is formed between the core 2 loaded into the shellforming mold 4 and the inner wall of the cavity 400 of the shell formingmold 4. After that, after the core 2 has been loaded into the shellforming mold, the melted resin is injected into the cavity of the shellforming mold at a high speed and a high pressure, and after thecompletion of the injection, the injected transparent resin is cooled.

After the completion of the cooling, a handgrip including the core 2 andthe shell 3 covering the core 2 is extracted from the shell forming mold4.

Thereafter, the clamping rib 200 formed on the outer surface of the core2 of the extracted handgrip is removed, so that only the core 2 and theshell 3 remain.

In other words, since the clamping rib 200 is formed at a lower side ofone end of the core 2, when the handgrip from which the clamping rib 200is removed is installed in a door or the like as shown in FIG. 2, atrace of the clamping rib 200 does not remain, so that appearance of thehandgrip is beautified.

Also, after the completion of the forming of the core 2, prior toloading the core 2 into the shell forming mold 4, the step of carving orrelieving a character or figure on the surface of the formed core 2 maybe further included.

Separately, after the completion of the forming of the core 2, a metallayer may be formed on the surface of the core 2, which is formed by aplating or a sputtering deposition.

Further, the core 2 applied to the fabrication method of the handgripaccording to the fourth embodiment of the present invention is made of amaterial of which melting point should be 200° C. or more and themelting point of the shell should be below 150° C.

Furthermore, the core 2 is preferably of a material havingimpact-resistant, high strength, high fluidity, high gloss and highplating-adhering strength properties. The material having the aboveproperties of the core 2 includes Nylon and PC.

Moreover, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. The material having the above properties of the shell 3includes ABS, PMMA, Surlyn, ASA and ALPHALAC.

According to the fourth embodiment of the present invention, the resinmay be a transparent resin that has a color but does not weaken or harmthe transparency and at the same time beautifies the appearance.

Meanwhile, FIG. 30 is to illustrate problems that may be generated inthe fabricating methods of a handgrip according to the first to fourthembodiments, and in the aforementioned first to fourth embodiments,there have been provided new handgrip structures and methods forfabricating the same in which a problem in that coating peels off and aproblem in that relieved or carved figure or character is damaged aresolved, thereby capable of developing the beauty on appearance of thehandgrip differentially from a conventional one.

However, according to the fabrication methods of the handgrips disclosedin the aforementioned respective embodiments, the following problems maybe caused.

In other words, as shown in FIG. 30, in case of forming a shell 3 byinjecting resin in a state where a molded core 2 is loaded into a shellforming mold 40, a gate for the injection of the resin is located overthe shell forming mold 40, so that a thin leaf portion (“A” of FIG. 30)is first filled before a thick leaf portion (“B” of FIG. 30) located onthe front of the shell 3 is filled. As a result, a time necessary infilling resin is lengthened, or a less-filling phenomenon occurs, andthus a weld line is formed on the shell 3, so that the appearance of thehandgrip may be harmed.

Here, the thick leaf portion is indicative of the front portion of thefan shaped shell 3, which is thicker than other portions, and the thinleaf portion is indicative of the rear portion, which is thin inthickness of the shell 3. The weld line is indicative of a line shown onappearance, which is formed at a mid portion where the melted resinrespectively fills left and right portions at different speeds startingfrom the thick leaf portion of the fan shape that is located at the rearside and again joins.

A fifth embodiment of the present invention is provided to solve theaforementioned problems. Accordingly, in the below, the fifth embodimentwill be described in detail with reference to FIGS. 31 to 33.

FIG. 31 is to illustrate a method for fabricating a handgrip accordingto a fifth embodiment of the present invention, and is a sectional viewshowing a state in which a core is loaded into a shell forming mold,FIG. 32 is to illustrate a characteristic of the fabrication methodaccording to the fifth embodiment, and is an exemplary sectional view ofa masking region arranged on the surface of the core, and FIG. 33 is abottom perspective view of the core, which shows the masking region ofFIG. 32.

According to a fifth embodiment of the invention, a handgrip 1 includesa core 2 and a transparent shell 3 covering the core 2.

Here, the core 2 has a predetermined curvature along a selecteddirection for an easy grip.

Also, a concaved groove 260 may be formed wholly along a lengthdirection on the lower surface of the core 2, and a coupling boss 240 a,240 b may be formed at both ends of the core 2.

At least one end of the shell 3 may be a fan shape as it travels to bothends.

Especially, a portion corresponding to both oblique sides of the fanshape is preferably inwardly curved for an easy grip.

In other words, in case the portion corresponding to both oblique sidesin the fan shape of the shell 3 is inwardly curved, from the ergonomicpoint of view, the handgrip is well harmonized with shape of a side ofthe hand as fisted and shape of thumb or middle finger, thereby making arole in increasing grip force for the handgrip 1 and helping to easilygrip the handgrip 1.

Meanwhile, a colored layer formed on the surface of the core 2 is of acolored metal layer. At this time, the colored metal layer is formed bya plating method or a sputtering deposition.

Simultaneously, a color may be added to the shell 3 so as to maintaintransparency of the shell 3 and beautify the appearance. In other words,the shell 3 may be formed from a transparent resin that has a color butdoes not weaken or harm the transparency and at the same time beautifiesthe appearance.

Preferably, the core 2 has a material property of which melting point ishigher than that of the shell 3. More specifically, it is desirous thatthe melting point of the core 2 is 200° C. or more and the melting pointof the shell 3 is below 150° C.

Also, the core 2 is of a material having impact-resistant, highstrength, high fluidity, high gloss and high plating-adhering strength.An example of the core material for satisfying such conditions includesNylon, PC (Polycarbonate) or the like.

Meanwhile, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties. In order to satisfy these conditions, the shell is of ABS,PMMA, Surlyn, ASA, ALDPHALAC or the like.

Also, character or figure may be carved or relieved on the surface ofthe core 2.

In addition, the lower surface of the shell 3 is formed in aconcavo-convex structure having a dimple portion such that slip isprevented to thereby make it easy to grip the handgrip.

Further, the coupling boss 240 a, 240 b formed at both ends of the core2 during the molding thereof functions to allow the handgrip 1 to bescrew-coupled with a door, a lid or the like.

Meanwhile, the core forming mold may be designed to be provided, at anouter side thereof when the core has been formed, with a clamping rib200 that is clamped by a mold 40 for forming a shell, and with acoupling boss 240 a, 240 b that is coupled with a door or the like afterthe completion of the handgrip, and at the lower surface of the corewith a concaved groove 260.

Also, a gate 410 of the shell forming mold 40 is located at a position(“B” of FIG. 30) constituting the thick leaf portion after the formationof the shell.

At this time, the gate 410 is formed preferably declined by apredetermined angle (θ) with respect to a horizontal plane, and morepreferably declined along a tangent direction drawn to pass through oneend of the gate 410 and be in contact with an upper surface of the core2.

Hereinafter, a method for fabricating a handgrip according to the fourthembodiment of the present invention is described as follows.

First, in a state that a mold (not shown) for forming a core isprepared, a melted resin having a color is injected into a cavity 400 ofthe core forming mold 6. In other words, the core is formed by aninjection molding that is a representative of plastic processing methodsand is widely used in processing plastic products having a complicatedshape.

At this time, the core forming mold 6 may be designed to be provided, atan outer side thereof when the core has been formed, with a clamping rib200 that is clamped by a mold for forming a shell, and a coupling boss240 a, 240 b that is coupled with a door or the like after thecompletion of the handgrip, and with a concaved groove 260 on the lowersurface of the core.

Here, in order to enable to form the coupling boss 240 a, 240 b, agroove for forming the boss is formed in a lower mold of the mold 6, anda rod-shaped rib (not shown) that after the mold 6 is removed, makes acoupling hole of the coupling boss 240 a, 240 b formed is provided at acenter portion of the boss forming groove.

Meanwhile, after extracting the molded core 2, prior to loading theextracted core 2, a surface treatment for coloring a surface of theextracted core is carried out.

At this time, the surface treatment is carried out by covering apredetermined masking region of the core with a mask so as to define thepredetermined masking region where a colored layer should not be formed,forming the colored layer at a portion other than the masking region 500of the core 2, and removing the mask covered on the masking region 500.

Here, the colored layer formed on the surface of the core 2 is of acolored metal layer, which is formed by a plating or a sputteringdeposition.

Meanwhile, the color surface-treated core is loaded into a shell formingmold 40 having a cavity 400 that is larger in volume than the core 2.

A gate 410 of the shell forming mold 40 is located at a position (“B” ofFIG. 30) constituting the thick leaf portion after the formation of theshell, to be declined by a predetermined angle (θ) with respect to ahorizontal plane.

Especially, the gate 410 of the shell forming mold 40 is preferablyformed so as to accord with a tangent direction drawn to pass throughone end of the gate 410 and be in contact with an upper surface of thecore 2.

Why the gate 410 is formed declined by a predetermined angle (θ) withrespect to a horizontal plane is that in case the gate 410 formed bycoupling the upper mold 40 a and the lower mold 40 b is a structuredirected toward the horizontal direction, as the resin is first filledin a lower space of the core 2 of the cavity 400, the pressure pushingthe core 2 upward becomes larger than the pressure pushing the coredownward, so that the core comes off and thus a deviation phenomenonfrom a fixed position may occur.

Thus, according to the fabrication method of the present embodiment, theresin injected through the gate 410 of the shell forming mold 40 firstfills an upper portion of the core 2.

In other words, the filling of the resin is first carried out withrespect to the upper side portion of the core 2, thereby preventingfailure in the appearance of the core 2 due to the coming off of thecore 2.

Meanwhile, the melted resin is injected through the gate 410 of theshell forming mold 40 at a high speed and a high pressure, and after thecompletion of the injection, the injected transparent resin is cooled.After the completion of the cooling, a handgrip including the core 2 andthe shell 3 covering the core 2 is extracted from the shell forming mold4.

Thereafter, the clamping rib 200 formed on the outer surface of the core2 of the extracted handgrip is removed, so that only the core 2 and theshell 3 remain.

In other words, since the clamping rib 200 is formed at a lower side ofone end of the core 2, when the handgrip from which the clamping rib 200is removed is installed in a door or the like as shown in FIG. 2, atrace of the clamping rib 200 does not remain, so that appearance of thehandgrip is beautified.

Meanwhile, in the aforementioned forming step of the shell 3, due to alack of adhesive force between the color-treated surface of the core 2and the shell 3, a space may be created between the core 2 and the shell3. To this end, there may occur a problem in that when the handgrip isviewed from an outside, the shape and the color formed on the surface ofthe core 2 are visually distorted.

Along with this visual distortion problem, in case the adhesive forcebetween the color-treated surface of the core 2 and the shell 3 isinsufficient, moisture is penetrated into a space between the core 2 andthe shell 3 during test of the handgrip products, such as theenvironment suitability test so that there may be a worry on the qualitybeing lowered.

In the above, the lack phenomenon of the adhesive force between thetreated surface of the core 2 and the shell 3 occurs when thetemperature of the melted resin is lowered due to a low temperature ofthe mold 40 or a contact of the core surface with moisture or foreignparticles. Especially, this non-adhesiveness phenomenon has a highoccurrence possibility at the region “C” of FIG. 32.

Accordingly, the fifth embodiment of the invention does not perform thesurface treatment for coloring a predetermined region on the surface ofthe core 2, thereby removing the lowering in the adhesive force betweenthe surface of the core 2 and the shell 3.

In other words, since the adhesive force between the surface of the core2 where the colored layer is not formed, and the shell 3 shows asuperior characteristic compared with the adhesive force between thecolored layer and the shell 3, a selected region of the surface of thecore 2 is processed not to have the colored layer, so that an overalladhesive force between the core 2 and the shell 3 is increased throughthe direct adhesion of the surface of the core 2 and the shell 3,thereby preventing occurrence of a non-adhered portion.

For instance, in case the core 2 is of Nylon and the shell 3 is ofSurlyn, the adhesive force therebetween is superior when they aredirectly adhered to each other. Accordingly, it is permitted not to formthe colored layer at a portion where the colored layer is not necessaryin the surface of the core 2, thereby no harming the sense of beauty onappearance and even preventing the occurrence of non-adhering portionbetween the core 2 of Nylon and the shell 3 of Surlyn.

At this time, as exemplarily shown in FIGS. 32 and 33, it is requestedthat the masking region where no surface treatment for the coloring ispermitted preferably corresponds to an unexposed portion on appearancewhen installing the handgrip at door, lid or the like, but such arequest is not essential. In other words, any portion other than theregion shown in FIGS. 32 and 33, is possible if the portion correspondsto a contact portion with the resin during the forming process of theshell 3.

Meanwhile, prior to loading the molded core 2 into the shell formingmold 4, the step of carving or relieving a character or figure on thesurface of the formed core 2 may be further included.

Simultaneously, the shell 3 may be formed from a transparent resin thathas a color but does not weaken or harm the transparency and at the sametime beautifies the appearance.

Further, the core 2 applied to the fabrication method of the handgripaccording to the fifth embodiment of the present invention is made of amaterial of which melting point should be 200° C. or more and themelting point of the shell should be below 150° C.

Furthermore, the core 2 is preferably of a material havingimpact-resistant, high strength, high fluidity, high gloss and highplating-adhering strength properties, such as Nylon and PC.

Moreover, the shell 3 is of a material having impact-resistant, highstrength, high fluidity, fire retardancy, heat-resistant,chemical-resistant, corrosion-resistant and charging-preventingproperties, such as ABS, PMMA, Surlyn, ASA and ALPHALAC.

Meanwhile, after forming the shell 3, in case the shell 3 is a softmaterial, such as Surlyn or the like, a glossy wax is coated on asurface of the shell 3 for the prevention of scratch.

In other words, according to the conventional fabrication method of thehandgrip, in case the shell 3 is a soft material such as Surlyn or thelike, the soft shell is soft to the touch, but a high possibility in theoccurrence of scratch exists in. 0.3

In this case, scratch may occur during the handling period of thehandgrip products before the products are surveyed to consumers, therebycausing a problem in that the reliability is lowered.

So, the handgrip fabricated according to the present embodiment followsthe step of removing a spot generated on the surface of the shell 3 dueto a contact with water during the cooling process. In order to removethis spot, the aforementioned wax is used, thereby allowing the spot tobe easily removed and simultaneously scratch to be prevented.

At this time, the glossy wax also functions to prevent penetration ofmoisture into the interior of the handgrip 1.

INDUSTRIAL APPLICABILITY

As described above, according to the present invention, a problemoccurring at the conventional handgrip, e.g., a problems in that coatingpeels off or relieved or carved figure or character is damaged issolved, and it becomes possible to develop the beauty on appearance ofthe handgrip differentially from the conventional one.

In other words, the handgrip fabricated by the conventional method hasthe problems in that the coating peels off due to user's repeated usageor is decolored, but according to the respective embodiments of thepresent invention, these problems are solved.

Also, according to the respective embodiments, the handgrip of thepresent invention makes the shell protect character or figure relievedor carved on the core, so that an interference of the figure orcharacter with other articles is excluded and accordingly there issolved a conventional problem in that the character or figure is lostdue to the interference.

In addition, the coating surface of the conventional handgrip is weak inthe contact with chemicals such as cosmetics, but the handgripsaccording to the first to fifth embodiments have the shell made oftransparent resin having superior chemistry-resistant property orchemicals-resistant property, thereby solving the contact problems.

Further, in the handgrips according to the first to fifth embodiments ofthe invention, since the outer shell made of transparent resin coversthe inner core, it provides sense to the touch different from theconventional handgrip, and particularly if the shell is made of acolored transparent resin, it becomes possible to realize handgripshaving a variety of colors for users' preference.

Meanwhile, according to the respective embodiment of the invention, itis possible to lower the weight of the handgrip, thereby making it easyto handle the handgrip or door or lid to which the handgrip is coupled.In other words, the handgrip fabricated by the conventional method hasthe problems in that the weight is heavy, the coating peels off due touser's repeated usage or the coating is decolored after the elapse oflong term, but according to the first to fifth embodiment of theinvention, since the core of the handgrip is formed by the blowinjection or the lower surface of the core is formed in a concaved form,the handgrip is light in weight, and since the shell is made oftransparent resin, a phenomenon in that the coating peels off ordecolored is prevented.

In addition, according to the fifth embodiment of the present invention,in performing the fabrication process of the handgrip including thecolored core and the transparent shell, there are solved a phenomenon inthat it takes a long time in filling the resin during the formation ofthe shell, a phenomenon in that resin is not completely filled, and aphenomenon in that a weld line is created.

In addition, according to the fifth embodiment of the present invention,there is solved a problem in that an adhesive force between core surfaceas treated and shell is insufficient and thus a space is created betweenthe core and the shell.

Further, according to the fifth embodiment of the present invention,there is solved a scratch problem occurring when the handgrip productsin which the shell is a soft material, are handled.

Accordingly, the present invention can be used valuably.

While the present invention has been described and illustrated hereinwith reference to the preferred embodiments thereof, it will be apparentto those skilled in the art that various modifications and variationscan be made therein without departing from the spirit and scope of theinvention. Thus, it is intended that the present invention covers themodifications and variations of this invention that come within thescope of the appended claims and their equivalents.

1. A method for fabricating a handgrip, said method comprising the stepsof: molding a colored core within a core forming mold, said core havinga concaved groove formed wholly along a length direction at a lowersurface thereof and a coupling boss formed at both ends thereof to bedirected toward a lower direction having a cavity therein and a couplingboss formed at both ends thereof; extracting the molded core; covering apredetermined surface region of the core with a mask so as to define thepredetermined surface region where a colored layer should not be formed;forming the colored layer except for the predetermined surface regioncovered with the mask; and removing the mask performing a surfacetreatment for coloring a surface of the core; loading the core into ashell forming mold having a cavity that is larger in volume than thecore such that a gate of the shell forming mold is located at a positionforming a thick leaf portion of a shell after forming the shell;injecting a transparent resin into the cavity of the shell forming moldto form a shell covering the core; and extracting the handgrip comprisedof the core and the shell from the shell forming mold.
 2. A method forfabricating a handgrip, said method comprising the steps of: molding acolored core within a core forming mold, said core having a concavedgroove formed wholly along a length direction at a lower surface thereofand a coupling boss formed at both ends thereof to be directed toward alower direction having a cavity therein and a coupling boss formed atboth ends thereof; extracting the molded core; performing a surfacetreatment for coloring a surface of the core; loading the core into ashell forming mold having a cavity that is larger in volume than thecore such that a gate of the shell forming mold is located at a positionforming a thick leaf portion of a shell after forming the shell;injecting a transparent resin into the cavity of the shell forming moldto form a shell covering the core; and extracting the handgrip comprisedof the core and the shell from the shell forming mold.
 3. The method ofclaim 2, wherein said core contains at least one of Nylon and PC.
 4. Themethod of claim 2, wherein said shell comprises at least one selectedfrom a group consisting of ABS, PMMA, Surlyn, ASA and ALPHALAC.
 5. Themethod of claim 2, wherein the gate of the shell forming mold is formeddeclined by a predetermined angle with respect to a horizontal plane. 6.The method of claim 5, wherein the gate of the shell forming mold isdeclined along a tangent direction drawn to pass through one end of thegate and be in contact with an upper surface of the core.
 7. The methodof claim 2, wherein before the molded core is loaded into the shellforming mold, the core is subject to a surface treatment for coloringthe surface of the core.
 8. The method of claim 7, wherein the surfacetreatment comprises the steps of: covering a predetermined region of thecore with a mask so as to define the predetermined region where acolored layer should not be formed; forming the colored layer except forthe predetermined region covered with the mask; and removing the mask.9. The method of claim 7, wherein the colored layer is a metal layer.10. The method of claim 9, wherein the metal layer is formed by aplating process or a sputtering process.
 11. The method of claim 8,wherein the region covered with the mask corresponds to an unexposedregion on appearance when the handgrip is installed in a door, a lid orthe like and simultaneously to a region in contact with the resin duringthe molding step.
 12. The method of claim 2, if the shell is a softmaterial after forming the shell, further comprising the step of coatinga glossy wax on a surface of the shell.
 13. The method of claim 12,wherein the shell is Surlyn.
 14. A method for fabricating a handgrip,said method comprising the steps of molding a core having apredetermined curvature; loading the core into a shell forming moldhaving a cavity that is larger in volume than the core, wherein beforethe molded core is loaded into the shell forming mold, the core issubject to a surface treatment that colors the surface of the core; andinjecting a transparent resin into the cavity of the shell forming moldto form a shell covering the core thereby forming the handgrip; whereina gate of the shell forming mold is located prior to performing the stepof forming the shell at a position forming a thick leaf portion aftercompletion of the forming of the shell.
 15. The method of claim 14,wherein said core comprises a clamping rib formed at one end thereof,said clamping rib is, when the core is loaded into a shell forming mold,clamped by the shell forming mold to support the core.
 16. The method ofclaim 14, wherein said core contains at least one of Nylon and PC. 17.The method of claim 14, wherein said shell comprises at least oneselected from a group consisting of ABS, PMMA, Surlyn, ASA and ALPHALAC.18. The method of claim 14, wherein the gate of the shell forming moldis formed declined by a predetermined angle with respect to a horizontalplane.
 19. The method of claim 18, wherein the gate of the shell formingmold is declined along a tangent direction drawn to pass through one endof the gate and be in contact with an upper surface of the core.
 20. Themethod of claim 14, wherein the surface treatment comprises the stepsof: covering a predetermined region of the core with a mask so as todefine the predetermined region where a colored layer should not beformed; forming the colored layer except for the predetermined regioncovered with the mask; and removing the mask.
 21. The method of claim20, wherein the colored layer is a metal layer.
 22. The method of claim21, wherein the metal layer is formed by a plating process or asputtering process.
 23. The method of claim 20, wherein the regioncovered with the mask corresponds to an unexposed region on appearancewhen the handgrip is installed in a door or a lid and simultaneously toa region in contact with the resin during the molding step.
 24. Themethod of claim 14, if the shell is a soft material after forming theshell, further comprising the step of coating a glossy wax on a surfaceof the shell.
 25. The method of claim 24, wherein the shell is Surlyn.